Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fd3664cea18bc311843108d9ed11a9b8e807276869e0888c616d1e6c31b22c' 
  AND token = 'qezmJx6IAg+U5GMI304tw7clIh5Bo1F1SzmbUGT9AQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}